// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_FILE_DESCRIPTOR_INFO_IMPL_H_
#define CONTENT_BROWSER_FILE_DESCRIPTOR_INFO_IMPL_H_

#include <stddef.h>

#include <map>
#include <memory>
#include <vector>

#include "base/files/memory_mapped_file.h"
#include "content/common/content_export.h"
#include "content/public/browser/file_descriptor_info.h"

namespace content {

class FileDescriptorInfoImpl : public FileDescriptorInfo {
public:
    CONTENT_EXPORT static std::unique_ptr<FileDescriptorInfo> Create();

    ~FileDescriptorInfoImpl() override;
    void Share(int id, base::PlatformFile fd) override;
    void ShareWithRegion(int id, base::PlatformFile fd,
        const base::MemoryMappedFile::Region& region) override;
    void Transfer(int id, base::ScopedFD fd) override;
    const base::FileHandleMappingVector& GetMapping() const override;
    std::unique_ptr<base::FileHandleMappingVector> GetMappingWithIDAdjustment(
        int delta) const override;
    base::PlatformFile GetFDAt(size_t i) const override;
    int GetIDAt(size_t i) const override;
    const base::MemoryMappedFile::Region& GetRegionAt(size_t i) const override;
    size_t GetMappingSize() const override;
    bool OwnsFD(base::PlatformFile file) const override;
    base::ScopedFD ReleaseFD(base::PlatformFile file) override;

private:
    FileDescriptorInfoImpl();

    void AddToMapping(int id, base::PlatformFile fd,
        const base::MemoryMappedFile::Region& region);
    bool HasID(int id) const;
    base::FileHandleMappingVector mapping_;
    // Maps the ID of a FD to the region to use for that FD, the whole file if not
    // in the map.
    std::map<int, base::MemoryMappedFile::Region> ids_to_regions_;
    std::vector<base::ScopedFD> owned_descriptors_;
};
}

#endif // CONTENT_BROWSER_FILE_DESCRIPTOR_INFO_IMPL_H_
